Floor cleaning machine



FIG. 1 is a front, top and right side perspective view of a floor cleaning machine showing the new design;

FIG. 2 is a front, top and left side perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a left side elevational view thereof; and,

FIG. 7 is a top plan view thereof.

The broken line showing of various elements in FIG. 5 forms no part of the claimed design. 

CLAIM The ornamental design for a floor cleaning machine, as shown and described. 